On Thu, Nov 12, 2009 at 06:10:31PM +0100, Peter Zijlstra wrote:
>
> diff --git a/kernel/sched.c b/kernel/sched.c
> index 1f2e99d..62df61c 100644
> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -2377,6 +2377,9 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state,
> task_rq_unlock(rq, &flags);
>
How about this ?
again:
cpu = p->sched_class->select_task_rq(p, SD_BALANCE_WAKE, wake_flags);
if (!cpu_online(cpu))
cpu = cpumask_any_and(&p->cpus_allowed, cpu_active_mask);
if (!cpu) {
set_task_affinity();
goto again;
}
> +
> if (cpu != orig_cpu) {
> local_irq_save(flags);
> rq = cpu_rq(cpu);
Will it help further narrow down the window ?
>
>
> Something I think Mike also tried and didn't deadlock for him..
>
> Sachin, Mike, could you try the above snippet and verify if it does
> indeed solve your respective issues?
>
> /me prays it does, because otherwise I'm fresh out of clue...
--
Thanks and Regards
gautham
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